1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 by Ralf Baechle
7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
8 */
9#ifndef _ASM_CACHEFLUSH_H
10#define _ASM_CACHEFLUSH_H
11
12/* Keep includes the same across arches.  */
13#include <linux/mm.h>
14#include <asm/cpu-features.h>
15
16/* Cache flushing:
17 *
18 *  - flush_cache_all() flushes entire cache
19 *  - flush_cache_mm(mm) flushes the specified mm context's cache lines
20 *  - flush_cache_dup mm(mm) handles cache flushing when forking
21 *  - flush_cache_page(mm, vmaddr, pfn) flushes a single page
22 *  - flush_cache_range(vma, start, end) flushes a range of pages
23 *  - flush_icache_range(start, end) flush a range of instructions
24 *  - flush_dcache_page(pg) flushes(wback&invalidates) a page for dcache
25 *
26 * MIPS specific flush operations:
27 *
28 *  - flush_cache_sigtramp() flush signal trampoline
29 *  - flush_icache_all() flush the entire instruction cache
30 *  - flush_data_cache_page() flushes a page from the data cache
31 */
32
33 /*
34 * This flag is used to indicate that the page pointed to by a pte
35 * is dirty and requires cleaning before returning it to the user.
36 */
37#define PG_dcache_dirty			PG_arch_1
38
39#define Page_dcache_dirty(page)		\
40	test_bit(PG_dcache_dirty, &(page)->flags)
41#define SetPageDcacheDirty(page)	\
42	set_bit(PG_dcache_dirty, &(page)->flags)
43#define ClearPageDcacheDirty(page)	\
44	clear_bit(PG_dcache_dirty, &(page)->flags)
45
46extern void (*flush_cache_all)(void);
47extern void (*__flush_cache_all)(void);
48extern void (*flush_cache_mm)(struct mm_struct *mm);
49#define flush_cache_dup_mm(mm)	do { (void) (mm); } while (0)
50extern void (*flush_cache_range)(struct vm_area_struct *vma,
51	unsigned long start, unsigned long end);
52extern void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn);
53extern void __flush_dcache_page(struct page *page);
54
55#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
56static inline void flush_dcache_page(struct page *page)
57{
58	if (cpu_has_dc_aliases)
59		__flush_dcache_page(page);
60	else if (!cpu_has_ic_fills_f_dc)
61		SetPageDcacheDirty(page);
62}
63
64#define flush_dcache_mmap_lock(mapping)		do { } while (0)
65#define flush_dcache_mmap_unlock(mapping)	do { } while (0)
66
67#define ARCH_HAS_FLUSH_ANON_PAGE
68extern void __flush_anon_page(struct page *, unsigned long);
69static inline void flush_anon_page(struct vm_area_struct *vma,
70	struct page *page, unsigned long vmaddr)
71{
72	if (cpu_has_dc_aliases && PageAnon(page))
73		__flush_anon_page(page, vmaddr);
74}
75
76static inline void flush_icache_page(struct vm_area_struct *vma,
77	struct page *page)
78{
79}
80
81extern void (*flush_icache_range)(unsigned long start, unsigned long end);
82extern void (*local_flush_icache_range)(unsigned long start, unsigned long end);
83
84extern void (*__flush_cache_vmap)(void);
85
86static inline void flush_cache_vmap(unsigned long start, unsigned long end)
87{
88	if (cpu_has_dc_aliases)
89		__flush_cache_vmap();
90}
91
92extern void (*__flush_cache_vunmap)(void);
93
94static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
95{
96	if (cpu_has_dc_aliases)
97		__flush_cache_vunmap();
98}
99
100extern void copy_to_user_page(struct vm_area_struct *vma,
101	struct page *page, unsigned long vaddr, void *dst, const void *src,
102	unsigned long len);
103
104extern void copy_from_user_page(struct vm_area_struct *vma,
105	struct page *page, unsigned long vaddr, void *dst, const void *src,
106	unsigned long len);
107
108extern void (*flush_cache_sigtramp)(unsigned long addr);
109extern void (*flush_icache_all)(void);
110extern void (*local_flush_data_cache_page)(void * addr);
111extern void (*flush_data_cache_page)(unsigned long addr);
112
113/* Run kernel code uncached, useful for cache probing functions. */
114unsigned long run_uncached(void *func);
115
116extern void *kmap_coherent(struct page *page, unsigned long addr);
117extern void kunmap_coherent(void);
118extern void *kmap_noncoherent(struct page *page, unsigned long addr);
119
120static inline void kunmap_noncoherent(void)
121{
122	kunmap_coherent();
123}
124
125#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
126static inline void flush_kernel_dcache_page(struct page *page)
127{
128	BUG_ON(cpu_has_dc_aliases && PageHighMem(page));
129}
130
131/*
132 * For now flush_kernel_vmap_range and invalidate_kernel_vmap_range both do a
133 * cache writeback and invalidate operation.
134 */
135extern void (*__flush_kernel_vmap_range)(unsigned long vaddr, int size);
136
137static inline void flush_kernel_vmap_range(void *vaddr, int size)
138{
139	if (cpu_has_dc_aliases)
140		__flush_kernel_vmap_range((unsigned long) vaddr, size);
141}
142
143static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
144{
145	if (cpu_has_dc_aliases)
146		__flush_kernel_vmap_range((unsigned long) vaddr, size);
147}
148
149#endif /* _ASM_CACHEFLUSH_H */
150